MeshLine

通过设置 Object3D.MeshLine 的相关属性，展示3D线段。

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          <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>MeshLine 线</title>
    <style>
        html, body, #container {
            margin: 0; padding: 0; width: 100%; height: 100%;
        }

        .inputs {
            position: absolute;
            bottom: 20px;
            right: 40px;
        }
    </style>
</head>
<body>
<div id="container"></div>
<div class="inputs">
    <label>宽度
        <input type="text" placeholder="请输入meshline的宽度" value="20" id="widthInput">
    </label>

    <label>高度
        <input type="text" placeholder="请输入meshline的高度" value="2000000" id="heightInput">
    </label>
    <button onclick="update()">更新</button>
</div>
<script src="//webapi.amap.com/maps?v=1.4.15&key=您申请的key值&plugin=Map3D"></script>
<script>
    var points = [
        new AMap.LngLat(116.400433, 39.908084),
        new AMap.LngLat(113.52412, 34.777709),
        new AMap.LngLat(108.821972, 34.270829),
        new AMap.LngLat(104.067108, 30.65769)
    ];

    var map = new AMap.Map('container', {
        center: [108.011931, 37.071694],
        zoom: 6,
        viewMode: '3D',
        pitch: 70
    });

    var object3Dlayer = new AMap.Object3DLayer();
    var numberOfPoints = 180;
    var minHeight = 20;

    var meshLine = new AMap.Object3D.MeshLine({
        path: computeBezier(points, numberOfPoints, minHeight),
        height: getEllipseHeight(numberOfPoints, 2000000, minHeight),
        color: 'rgba(55,129,240, 0.9)',
        width: 20
    });

    meshLine.transparent = true;
    object3Dlayer.add(meshLine);
    meshLine['backOrFront'] = 'both';
    map.add(object3Dlayer);

    function pointOnCubicBezier(cp, t) {
        var ax, bx, cx;
        var ay, by, cy;
        var tSquared, tCubed;

        cx = 3.0 * (cp[1].lng - cp[0].lng);
        bx = 3.0 * (cp[2].lng - cp[1].lng) - cx;
        ax = cp[3].lng - cp[0].lng - cx - bx;

        cy = 3.0 * (cp[1].lat - cp[0].lat);
        by = 3.0 * (cp[2].lat - cp[1].lat) - cy;
        ay = cp[3].lat - cp[0].lat - cy - by;

        tSquared = t * t;
        tCubed = tSquared * t;

        var lng = (ax * tCubed) + (bx * tSquared) + (cx * t) + cp[0].lng;
        var lat = (ay * tCubed) + (by * tSquared) + (cy * t) + cp[0].lat;

        return new AMap.LngLat(lng, lat);
    }

    function computeBezier(points, numberOfPoints) {
        var dt;
        var i;
        var curve = [];

        dt = 1.0 / (numberOfPoints - 1);

        for (i = 0; i < numberOfPoints; i++) {
            curve[i] = pointOnCubicBezier(points, i * dt);
        }

        return curve;
    }

    function getEllipseHeight(count, maxHeight, minHeight) {
        var height = [];
        var radionUnit = Math.PI / 180;

        for (var i = 0; i < count; i++) {
            var radion = i * radionUnit;

            height.push(minHeight + Math.sin(radion) * maxHeight);
        }

        return height;
    }

    function update() {
        var width = +document.querySelector('#widthInput').value;
        var maxHeight = +document.querySelector('#heightInput').value;

        if (width > 0) {
            meshLine.setWidth(width);
        } else {
            document.querySelector('#widthInput').value = 20;
        }

        if (maxHeight >= 1000) {
            meshLine.setHeight(getEllipseHeight(numberOfPoints, maxHeight, minHeight));
        } else {
            document.querySelector('#heightInput').value = 2000000;
        }
    }
</script>
</body>
</html>
        

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